Molding-machine.



No. 745,293. PAT

W. F.\PRINCB. MOLDING MACHINE.

APPLIUATION FILED APR. 11. 1900.

No MODEL.

BNTED NOV. 24, 1903.

Patented November 24, 1903.

PATENT OFFICE.

WALTER F. PRINCE, OF ELIZABETH, NEW JERSEY;

MOLDING-MACHI'NE.

SPECIFICATION forming part of Letters Patent No'. 745,293, dated November 24, 1903.

Application filed April 11, `1900 l To tZZ whom t may concern:

Be it known that I, WALTER F. PRINCE, a

' citizen of the United States, residing at Elizabeth, county of Union, and State of New Jersey, have invented certain new and useful Improvements in Molding-Machines, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

In making sand molds by machine as heretofore practiced the stripping-plate, which conforms to the pattern and through which the pattern is drawn from the sand, has been made of metal. It is necessary for the production of a perfect mold that these stripping-plates shall fit thepattern accurately, and the large expense of such plates has limited strictly the number of designs that could be commercially adapted to machine-molding, so that the old, slow, and expensive process of hand-molding without a stripping-plate has heretofore been used for many patterns, especially patterns of complicated design where the quantity of casts required was not very large, so as to make the production and use of the very expensive stripping-plates economical.

I have discovered that it is possible to use wooden stripping-plates in making sand molds by machine and otherwise and v'that by thev use of such wooden stripping-plates a very efficient action is secured. I am thus enabled to avoid the large expense of making' and carefully fitting the metal strippingplates heretofore used, so that by the use of such plates in combination with wooden patterns the expense of patterns and strippingplates is so far reduced that machine-molding with stripping-plates may be economically used in making sand molds from practically all designs of patterns, although -only very small quantities of casts are required, with a very large reduction in the cost of such casts.

While both Wooden stripping-plates and wooden patterns are preferably used in molding-machines embodyingmy invention, as the use of wooden patterns avoids the increased expense and Weight of apparatus resulting from the making and use of metal patterns, metal patterns may be used in combination with the wooden stripping-plates; and the invention includes such construe Serial No. 12,440. (No model.)

tions, aswell as certain specific featuresof specification, is applied in the preferred man- 'ner in connection with a molding-machine of a general class now Well known.

In the drawings, Figure l isa central vertical sectionv through the flask and machine with the flask filled and ready for the withdrawal of the pattern. Fig. 2 is a vertical section on the line 2 of Fig. l. Fig. 3 is a View similar toFig. 1, showing the liask and pattern with the pattern Withdrawn from the mold.

Referring to said drawings, A is the frame of the machine, in which is mounted the vertically-moving base-plate B, shown as actuated by levers 10, mounted on the frame and connected to the base-plate by links 1l and provided with operating-lever 1.2, the levers lO being connected by link 13, 'so as to move together. Upon the top of the base-plate B is mounted the pattern-plate C, carrying the pattern' D, which pattern is raised into and Withdrawn from the sand-flask through'the stripping-plate E by the operation of the levers 10, the flask F being placed in position upon the top of the frame A and its proper position secured by the positioning-pins 14 on the frame entering openings in ears on the iiask, as usual. Upon the top of the iask F is shown the bottom board G, upon which the Iiask stands when it is removed from the machine and reversed for casting.

The general arrangement and operation of the parts above described are the same as in connection with'molding-machines now inr IOO 3, so as to withdraw the pattern from the flask, and the flask, with the mold therein, is then lifted oft` the machine and reversed, so as to stand upon the bottom board G.

Referring now to the features forming the present invention, the stripping-plate E is made of wood instead of metal, and the pat tern D, with its pattern-board B, is also preferably made of wood. For the purpose of providing the proper support for the wooden stripping plate and securing the desired strength and rigidity I preferably provide the following construction instead of resting the stripping-plate directly upon the top of the frame A.

The top of the frame A is cut away on its inner side, so as to form an inner shoulder 15, on which the stripping-plate'E rests, and a iange 16 extending entirely about the stripping-plate and closely fitting the latter, this flange preferably being of exactly the same depth as the stripping-plate, as shown. The stripping-plate may be simply laid into the seat thus formed; but I preferably secure the stripping-plate in position by screws 1, passing through the flange 16 into the strippingplate,as shown. I find also th atI obtain a more sharply-defined mold by beveling the walls of the opening in the stripping-plate, as shown at 2 in the drawings, so as to provide an edge on the inner side of the stripping-plate about the pattern, and this feature is preferably used in connection with my stripping-plate, although this feature is not essential to the invention considered broadly.

Itwill be understood that it is not necessary that the entire plate C shall be of Wood orequivalent material, but only that the part forming the stripping-plate proper and tittihg the pattern shall be of such material, the expense and difficulties in the use of metal stripping-plates arising from the fitting of the metal to the pattern. The plate C therefore may have a -metal backing or be otherwise partially formed of metal so long as the stripping-plate proper, which is the portion immediately about the pattern that acts to strip the sand from the pattern, is of wood or equivalent material.

While I have used the term wooden in defining the stripping-plate, and I preferably use an ordinary board plate of the desired thickness on account of the excellent results secured and its cheapness, it will be understood that other equivalent materials may be used in place of an ordinary wooden board, such as the materials commonly known as Massa ber board, composition board, or ebonite, and such materials are to be considered the equivalents of wood in the constructions claimed and within my invention.

1. In an apparatus for making sand molds, the combination with the flask and pattern and means for moving the pattern into and withdrawing it from the flask, of a strippingplate of wood or similar material described herein as the equivalent of wood,substantially as described.

2. In an apparatus for making sand molds, the combination with the flask and a wooden pattern, and means for moving the pattern into and withdrawing it from the flask, of a stripping-plate of wood or similar material described herein as the equivalent of wood, substantially as described.

3. 1n an apparatus for making sand molds, the combination with 'the ask and pattern and means for moving the pattern into and withdrawing it from the iiask, of a strippingplate of Wood or similar material described herein as the equivalent of wood beveled about the stripping-opening so as to provide an edge about the pattern on the inner side of the stripping-plate, substantially as described.

4. In an apparatus for making sand molds, the combination with the iiask and a Wooden pattern and means for moving the pattern into and withdrawing it from the ask, of a stripping-plate of wood or similar material described herein as the equivalent of Wood beveled about the stripping-opening so as to provide an edge about the pattern on the inner side of the stripping-plate, substantially as described.

5. In a'moldingmachine, the combination with a stripping-plate of wood or similar material described herein as the equivalent of wood and a pattern, and means for moving the pattern through the stripping-plate to withdraw the pattern from the mold, of inner shoulder on the machine-frame forming a seat for the stripping-plate, and fiange 16 on the frameextendingentirelyaboutand closely fitting the stripping-plate, substantially as described.

In testimony whereof I have hereunto set my hand inl the presence of two subscribing Witnesses.

WALTER F. PRINCE. Witnesses: V. H. DULBODY, EDWARD P. Mona. 

